2000 ZR sno pro

[bgilbertson11]

I recently took the heads off my cat and as usual coolant went everywhere. I removed the bad jugs and noticed coolant in the bottom of the crankcase. I would assume that it got down there from when I took it apart. So my question is: Is there suppose to be coolant down there, and If not what is if anything. And if its not suppose to be down there what should I do.

Any help would be splendid.

[braindead1684]

I assume you can see the coolant in the bottom of the crank case not in any water jackets around the case?

Typically you can use an air compressor and blow out most of it, also you can put some oil in it and do it again. You don't want ANY antifreeze/water in their as it could cause bearing failure. Worst case you could split the cases and clean thouroughly and greese/ check all crank bearings.

FYI as you probably figured now, you should drain the anti-freeze first their are usualy plugs on the jugs to drain them all the way.

[bgilbertson11]

Thanks for the help.

I guess it would be easier to say that im rebuilding the topend of the motor and not sure what im doing, how to get the pistons back in the cylinders, the lbs of torque for the nuts, timing? pretty much everything. Any tips and cautions would be great.

Ill hope to see you all on the trails

[braindead1684]

Have you rebuilt any engine before? If so it similar to most builds.

This isn't in any particular order but some points you may need to know.

There is a pin on the piston where the rings line up. Once the rings are on you want to apply some oil to the inside of the jugs and the rings, also on the wrist pin. Attach the piston to the rods and make sure everything is tight and oiled up and clean of debris. You can use a ring compressor or compress them by hand (usualy works without problem) and slide them up into the jug makeing sure not to score the cylinder. Try not to use way to much oil but make sure you use enough to coat the surfaces.

Never re-use gaskets etc...

You will want to have someone check the surface on the heads as well as check the size of the jugs to make sure they are within spec as well as hone them if need be. I don't have my Cat manual anymore but someone on here will have one and they should be able to give you the specs. When in dought feel free to ask and take your time to do it right so you don't have to do it again.

[bgilbertson11]

Thanks for your help, does anyone have any info about the timing system on this snowmobile. I see its an adjustable timing control unit. Not sure how it works and when to use it.

[bgilbertson11]

How do you tell what is the front(intake side) of the piston and what is the back(exhaust side).

[pizmiester]

Been a while for me, but if I remember correct the arrow on the piston will point to the front of the motor. Double check by being sure that the rings can't open when they cross the exhaust port.